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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04e44be0b274e62e7c5e26aeddf8c8c9c1041b115a2ba2bdc3382d78b534858' 
  AND token = 'J9L6jyj14voLsPzefqHxlKxkC+58wQLJ49/sheRWd+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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