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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef9b42bc95437dbe1f17475ebf5a6ee73d2f305ae924b1e8b5e8f41aa3c4c30' 
  AND token = 'Ui5ljH5EDmWBmdvbqNMo9iWGR1fgjHQkNZ3JG287FgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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