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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c213b8c8b2907c7f30143b97e2d7a44cab3d1ad90ca688ccd3a151d5924329b4' 
  AND token = 'sxjK09coU6bBg1Ge9ceEz6F1vuC8cLak3IX6SQ6pwXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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