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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef828db1fdc69753ea96afed771b5921491e78ce1632dfd790a66e2f21c82fc' 
  AND token = 'b3bboBcD5ATRoYqVeMWzzhPsfh8DCSnzK8K3l/ab2I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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