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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eae02677fbb94cd3a4e6cc9338b4c0c10fe8146005825c3a9a921635ee2d9e5' 
  AND token = 'wjHkvuqZjBGkKqk5rqW5Krf3jUPsWozC312lgWp3CMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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