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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0903473d6c438f8945d12a2993946d842b42788f1ded0de309478a03bd1bdd2' 
  AND token = 'jAu5c/p1yxFqKEYPv9muam5AkHxv5kF0oB9vwBapOIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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