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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f02cb5b7c6ba1412ffe90581a5ecd98349438021e28bb3e6be2f52e17a6eef' 
  AND token = 'b/Et8s9YZNboV37nMqTLGS3BCpAYV9/HYilRBlbe/KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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