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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '838ee6aae1dc640b221e63530def8b779b8e7acf99fe0d897de8f5896578e24a' 
  AND token = 'z/vMuVEvVTVs970Laljb4lXOQQoB63NnCNm2G9v+wEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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