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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c51159acd4cbfa5ab9e9ae7e845c9f01c7122687862beccf7162b7d5e292e350' 
  AND token = 'ejbie2j61AyIvS3Q9Cjytwcp8QRjjWU/nI/2neAFA6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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