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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2335c6d9f0da7ba3a489e96ac58fd48d0bc6412ce6ea985e4aadcb88a0c4a1' 
  AND token = 'CldJ55M78z0VzxF/UzPPD0lVOgcwKv5aKCo/fpAB60w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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