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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbcb769790a0875c4034333c57ba7cef9278b2a08201c42ae57a4ddc0111674f' 
  AND token = 'YKtLkoyPkaxZ2n5IPSO1hzqh+tyr3MlcKhqIUXdU9ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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