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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ed01ea58ea28e22cc3c06205b27d9719b401e68f1d9d3c61d777fa22b5977e' 
  AND token = '36XMG0CjVuBkfJqZgL2WIZ4hzQ8ih82eVJM3uV601kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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