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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5bd3cec5272e22c341a07de15382024b3f2122c7a05ff16f76a81c6188545f' 
  AND token = '7uRk5gjCYQ7Su92SBi2WXUD/Hy14OvHWS3e5WXhNXEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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