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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feddf2ab51a8e3678411f9e8847800fed56bb09fdbb9bab2080e0c045470f741' 
  AND token = 'e00maRGhNNLzg8Uw+iTSZhvnTRba3i0cmD9bl2yyVWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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