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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4289fe4400bf513766264c461b7930ee0b3ab2db8d94e17f3f1dc4b1aa6683d7' 
  AND token = 'ms77aP/x10nk9ajSZ53LXJuVWt3oYrCkX5qUZCJfiWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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