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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28459636eeae8622f689c1ec0d73b155ba97867f1e1a795a588ab31b36508ba8' 
  AND token = '+cd51d/xHwpXAfAdkD5qgOq1p/jU8DgJrwQCcOQPheQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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