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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a941b2b055be930c9974ff08f2ab4de31d05938ea818778715d017709e5bb3' 
  AND token = 'GxKp516Or4i6TQeWadbA4qJP35Hivcm1Yrxxaka/ecQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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