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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66cbdeccaadbdc10c2cf4e7e5f74e1e3be2acfede63722263df91aae5fc39e66' 
  AND token = 'qHVWs3z7Y3i5sJxMiTFSWP04SuGHoAF8J76hYaNGwMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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