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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c88646d585a10f5766a4541a348cd71efbf3f415a3e258dc247a7f557989a5e' 
  AND token = 'BhqRTfab1+NFP41e/0eMS2vh/eX7xW+UjMcSPABj+oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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