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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39dc2aba038d90ae13530fc3ee5b0511e096c1214321cc9e6f820c64b14dfc0d' 
  AND token = '8DLG1CBqxhhCIgHT0LehLUF1OSs0c8x07YG5v5xwdSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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