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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b26fcc730cafde6cc03815915d9a6715eaf40be0cc572ae5e4c447f77c34c3' 
  AND token = 'zB8YwFzN7Q3/pDK3GSsgkZqcmEpMBdTKYdvZUoPA2PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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