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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a53b23ae6cee0e5f65f6020ba83f56ec6f997481b5f5990db64e8c4909a54ab' 
  AND token = 'BuxtxVr1Q2znevCe5eX/OZ+7mXrA9Tyw4m/Fqdi+43U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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