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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2160afcb1e99ed4aa10afcf48c374e2a6c4908dd87a07eb89f21b876f4b02b10' 
  AND token = '7C8R9Eiwm9pk6zXeAPGr7LCyvQOHM7pZjX6VtsriJGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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