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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47312512f941baa6f396198a7b67774eca9f1c0ef34bfda1c9f4a591f4b537c2' 
  AND token = 'gcXyVYsWr5jROWs/ZkZ7Z1ZNZaz1nezJ+cNvyzDvRAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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