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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a1efd2e34913c6302f9864c4924d8069dd2cf05e03ea24c6885484abdbd834' 
  AND token = '8ta3t9lxpVBlSo92ZqJgqBYoZnnNqXSILYFI54M5dfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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