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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d923f1788a4a83a4583e4091937e4c9bcfabfa4a9b79c68d8d0396667bc13a0' 
  AND token = '0mgu/BbqcfIJpUw4GLT0VVcXMC6yUgQUIHuPylx58+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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