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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c538120bbed32a01cced6e0ca0da50e8a3f402ac864598e44bf5056f7164112e' 
  AND token = 'BuOJhUhpCNyOoMoNcxI0D2QVh/HghjPjtizS2bTUQyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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