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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9589e16f160a38fd5f5bab24d1355ebd04717f8f7a3b35e521b4eefd9dea09f6' 
  AND token = 'NdRWzuMMQbAKqClZBMU9U7Dr2ErHYjMid0an2i3j3FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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