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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b3fe3a329ae1bb5fa5ea4c8d66f22a9e7a12961eae09e8341e4d530e8d6ddb' 
  AND token = 'SB0eMybQDHUiun9dAT2K1htVGo9dSOIn7moHvFKnB7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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