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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4412771884e34564328f77acd5d51a7ed4f8ce4f9ce6635742da98fb9dc90c6' 
  AND token = '16qMTiO7WS1Y5NvuSMjwjAEuIlMgaG34xI5p9z5Beos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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