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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b6a9eb1695468ff5e88bf72c87dea66e19528b87bc1855da11b1cf840b343e' 
  AND token = '9+Xcc8/c7AVwAJXzKJ2MbEc4mYKbrdNZHRDqZMLF88c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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