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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5b90ef685722cc581293f3cb4eaacf27fe96aa91171ffdf95d3c163f2e77e7' 
  AND token = 'xXGMyOdbAWTeXi/+Y8W3VrFqNeE0N6A3uJts1AVLPiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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