SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d368f045c1a65ad7ae96db7d2e9fd4bccf6663615c7c0849f2fd141c68a0a2' 
  AND token = 'DGRLwZg9Ij1YNHzDHGG13hIi5Kt2sQyQ8S5Hv/cbX8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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