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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf792e57f859134889cfa8c5d4914d3079280be110a122c92b5d86b56845bf8' 
  AND token = 'nwrfn61PtWuxEELSVdGsvHaJzu8bEkSSYhu8qpqgxNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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