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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184a2daf7857bf7d8b48d5211842bf8ef225afc120d63415ecd158ff0d205632' 
  AND token = 'FghCUnFE71l7Xx1/mJcfIxZH0JZmhVhrdCuSAIMmiRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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