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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3172b0a555fb1a1ffdb245813cf85cc1d1d8ab2cb5184f94c9aa9635c0ff38b0' 
  AND token = 'bBRPB79sWmCUC5CBLMkv31HM4TVSUUepVFEbVCpwR+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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