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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6688f54795c44ff54bad0cb6f14e2488d861a039e79221ba0f702c6c92f51e55' 
  AND token = 'qHPJNsmgC0Pn74LKkUMuyQlIAVARE8AFQQBLz965XbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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