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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ef91de9a5f687a96a864d2b48169905eb763c4f72f66b904df940f155920fd' 
  AND token = 'okrlMpc5oFHTuvor6BBWsN2oG6Rd24h9g8bnLtdFGe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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