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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87c9e92a3886fe9a25935fdeedca9c53479ab88bd30a720ae32a7407ebdd0c4' 
  AND token = '/frJq7Vbc5TbP+0m2bUIO+394HFAU0hPtcnKa8k8gPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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