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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3ec960071b039a627d98812972b1c35109b50768f555855d82646ed4ab0984' 
  AND token = '1k2CTo17KdbK2FCr1+oTPz5KLaot7ShUGGQUvYty9yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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