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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccbe8bbf5e07e3d07c6896b6dea848c213a16034300c05503b226d9896f5992b' 
  AND token = 'rt5KUnMc0BGs9AK4zmntci+jidxjLsRdO16NE1HEBYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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