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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3499bf0a6f3b2e1a3cf0ae093f2d67898a3471d9dcb5d27b6705785b1e87b5' 
  AND token = 'Tx2KdRLv3aJtNl2B4dYxTXPeGPUdcBo4jxtC5HYjBtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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