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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4e5e5368a4bf60d1f4d40dee235cc98ddc8c83e057986f8261788eed03bedb' 
  AND token = '/fLp4h2MshEgGJ7CZm7map7JYtYspLPYs49wWWr/U0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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