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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2e1b48ff3027ea21f4a60c1ced666564cff36de3d37ed11c58c45afad108934' 
  AND token = 'K92WoVVGKLVRmRT3q2O6B6sdZLVluSEtlG0Om10cfjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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