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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2997dd4e94670944b52593dbe2f605a357bc58ccaa78bfdc67d25ebbd4868e49' 
  AND token = '+tkBuX6w9NTTllI9PO9ruNe6SU9rvbZZytQ+vgN4Ftc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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