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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cfb70cdbb111d89202d54cb08114b540208a3934a0a1ba4d6c10b812f8147b3' 
  AND token = 'B9fxVUJQ9cNfGD6NMY5W4KD8xJS3K9Z9NQKZKoNdMEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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