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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b7a4899b9171e7c635844f3ccfb66745edae58e3fa54bf1ee0f3cf55fa45ba' 
  AND token = '2657+8W9ChbfewdozKBJabdky7j8xwsA2ylAzxIBvP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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