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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b52aad421cee0b3e3eb16a154a19f41d4dfdb84da463e14afe9c335332655f6' 
  AND token = 'HoJCJDrV68C3eUH8fYvE7WOFgNvb3VCc9ThxpE3tvzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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