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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff6eaef8b0ca8240d373b1ac22531e1238bf63a4e67a20a69301611849804883' 
  AND token = '5G/p06KWIST98YbM/bEbh+e58DV1uvs/IB3wkSsQDTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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