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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd7a2b4f922c49bf49d178188f686d250f1fba1c0b31ad3a26db135d60d9d7f' 
  AND token = 'ED7DJltSBRva+6BESn19icrJHaHXPdE+1WmznVdLU+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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