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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd423ef74828df27e9f7b6ccf90f3a1a9fd8172f95d1b4b2cb1d247b20c01a0f3' 
  AND token = 'XWT9zJJ7Ak5EuQgq3FGc2bkKmaNw2elp9xmZZHfRLrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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