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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db16bfa736d3de233084809da091c372468b772e8a07bd9d2e06bcf48e7ee7c' 
  AND token = 'BA3Cbuu4d0RROCFuAKnN4Wzt/uQ4rsfEqf5Kkyc5+GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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