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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07803c54d94a20fb8590408cea70c341ab267fdb71528c66f83709d6d8270ef' 
  AND token = 'UifD8B/oeFMAJ6v6nmTZIYYbM2g4/5Q0ZPWmjeEuV08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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