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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85906191ae8ea45d57bb033cab509116b26a15d8ad153db4a6908cc5c64c788d' 
  AND token = 'ksj2Px63WnNkgmyNJj6hndIRRqAyEfj705dvWuMZG9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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