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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5552ad1d3b9693065d047a049bc2caa1195fa65e9a621d8e0097cb9abf4e0c83' 
  AND token = 'H9B8V80NLxdCot3B2vdjEHR3PSgNNfksu5p2TznWrzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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