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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f333f17485b71d6bf99ff1abd42e30f74122e3dc54fbb6c6debd32c6beef708' 
  AND token = 'jL1h2ELzgQu1XHo4obq9I+uETxeLoXyPUdq9f0SmXIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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