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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f6932eeefceb28fc7186034b81b310687607c73414391dcc199f5e958e78d9' 
  AND token = 'd0mWaDIEpRD/FsHPTug+MADVnug22flVm1x6DBQM8hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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