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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825a21a1a77be558da8cc2e7cac54d9b56e277b13b977ffcca4f59a093a4cebd' 
  AND token = 'YWMZp4dWTMNY3GH1b67mYJz0w2V9M33BaOG6Y6/OvPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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