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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf6bb819b0cdbb2851a9bc37b6911ef63dc8a5c9136e01c2f2fcc870bdcf754' 
  AND token = 'uNF0Zf+LhViU57zmXaHsBHkbbAwnSJnDY2r135Q8DE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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