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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d0a6cfbce6156778d73b6184f446d3d9a66aa9adca2ad54ad3640dc7c8f9f8' 
  AND token = '1GHqA8HWMOTugdv4sN2ETmhH1+ycmKlWoHSg6EaxFoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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