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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31055eb6444130dc8bfcd2ca69af3ec468b86f1d50c19b6562caa76b14a63b5' 
  AND token = 'cQusGbyoJSSsZN3EqhB5kxVNH2wY/bJFwfTOFMeY8Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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