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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdfc2ec15b8b5bf79a53638507bbce88c1d7bf645fe380d21f9b8b1cdc50be08' 
  AND token = 'plqZ0o0Tht5GZoX/W3dXYN/eprU19mjyk5ptG+igAmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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