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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3084833a8fa3e1086e84fb6869fe22b8475c71ac737444a4ef9258d8aefb75b4' 
  AND token = 'J2HehPsYjRLvsxlZR/b6a1wImpXezJ/N6yA4i0a3JjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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