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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa534aaa806517a07a83ace3d7b52faa4f1fa2e22c8a1aa5dd5cc8a5560199f' 
  AND token = 'vgDDna40b87OvvnUTRvGOXovP/Rg0rUL6azT28fV5ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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