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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6441d4b18353c47669f5eb0fd546f855a654ed22d0abc159e61a2eb282ceed32' 
  AND token = 'XE4Ia0wQm0RCF6eHQijaPCOceNTqOuIVZH9yuHN2vlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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