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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa0c93d66344016b7d882c2e100f476ddc018b9133963ec942b8c1cc1a96af8' 
  AND token = 'sder+NAblsQsHPR7F4uNNudd6LSt8SsBZJTVsaRCY50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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