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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9660f9453f425fff661e2a9491f38723b1202aa9af9d66a93249a054864ca7c1' 
  AND token = 'rR3wt3fJkkDYiU19FwyjOAGhsCqKEbUTnVc46ZMi0i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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