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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d1ab9fb0f1cd61f84f1838aecbc62d7682432d3f4eb97c8e48797ef9b83601' 
  AND token = '5QnJ2MUt4s0NmTgZV2vkIL93ZwX3VaTMrzMCOrOkLng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}