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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dfd2b3bbb194453f48796882ab6d15af9eac6a2a2bb23ca1c5a83d1e30eea61' 
  AND token = '8AV4GYV4i+qywfSpy4ruZf8BCZk1aep6z+U4LOgtPMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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