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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd92742a5104a9489923d0807d9fb535bcad8a5552fb4121e59a765848d6530' 
  AND token = 'Sgqkk5bxTMtM9cEQN48fPbQ9hVA4Dl6vf3dkdqU4t14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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